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As medics await test results on a man from Ireland who may have contracted the Ebola virus, two US aid workers have been discharged after making a full recovery.
Dr Kent Brantly and aid worker Nancy Writebol underwent intensive, experimental treatment at Emory University Hospital after contracting the disease while in Liberia.
ITV News correspondent Lewis Vaughan Jones reports:
Travel and trade restrictions in West Africa could heighten shortages of food and basic supplies in affected areas, the World Health Organisation has warned.
Experts said Ebola-hit countries including Liberia, Sierra Leone and Guinea were already starting to suffer as fuel, food and basic supplies struggle to get through due to border closures and restrictions.
Violent clashes erupted in the West Point slum of Liberia's capital Monrovia yesterday after authorities quarantined the entire neighbourhood, and riot police were called to stop people trying to escape.
Today, police were there again, beating back some locals with canes as hundreds of people fought for a share of water and rice delivered on trucks.
Aid workers helped distribute the rations, but many are still going hungry.
The sophistication, wealth and military might of Islamic State militants pose a major threat to the United States that may surpass that from al Qaeda, US Defence Secretary Chuck Hagel said.
– Chuck Hagel, US Defence Secretary
They are beyond just a terrorist group. They marry ideology, a sophistication of ... military prowess. They are tremendously well-funded. This is beyond anything we've seen.
Asked if ISIS posed a threat comparable to that of the attacks of 9/11, Hagel said the group was "as sophisticated and well-funded as any group we have seen."
The US government decided to reveal the failed attempt to rescue James Foley and his fellow hostages in Syria as "several news outlets" were aware of the operation, Defence Secretary Chuck Hagel said.
Hagel told a news conference, "The underlying objective, as the President has said, was to rescue these hostages knowing that their lives were in danger ... it's the responsibility of our government and our leaders to do all we can to take action."
We'll do everything that we need to do, that the American people would expect from their leaders to continue to do everything we can to get our hostages back.
Pope Francis has phoned the parents of James Foley, the American journalist murdered by ISIS militants, the Catholic News Service reported.
The governor of Missouri has ordered the withdrawal of National Guard troops from riot-torn Ferguson, Missouri.
Tensions in the town have eased after protests were staged nightly since police killed an unarmed black teenager.
Peaceful demonstrations overnight were the calmest street gatherings in the small St. Louis suburb since riots erupted over the August 9 shooting of 18-year-old Michael Brown by a white police officer.
The African nation of Chad has said it will follow in South Africa's footsteps and introduce travel restrictions to countries suffering from the Ebola outbreak.
Prime Minister Kalzeubet Payimi Deubet said the country would close its border with Nigeria as part of efforts to prevent Ebola from entering the country.
He said the decision would have an "economic impact" on the region, but it was necessary for "public health needs".
It comes after South Africa banned entry to the country to all non-citizens travelling from Sierra Leone, Liberia and Guinea, while Liberia has quarantined entire neighbourhoods to try to stop the spread of the deadly virus.
"We do not pay ransoms," the US State Department said after it emerged journalist James Foley's captors demanded a ransom of €100 million (£80 million) before his death.
"One of the main ways Isil has been funded throughout this conflict has been from ransom payments that others have paid," spokeswoman Marie Harf said.
"We believe that paying ransoms or making concessions would both put all Americans overseas at greater risk for kidnapping and in harms way, but that ransoms would also fund and finance exactly the groups we are trying to degrade their capabilities," she told reporters.